Liquid-fuel-fired furnace.



A". LAING.

LIQUID FUEL FIRED FURNACE. APPLICATION I'I'LED MAR.18, 1912.

2 SHEETS-SHEET 1.

1,132,361. I 1 Patented Mar.16,1915.

THE NORRIS PETERS CO.. FHOTO LIIHOI WASHINGTON. D. C.

' A. LAING.

LIQUID FUEL FIRED FURNACE.

APPLIOATION TILED 111111.18, 1912.

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ANDREW LAING, OF NEWGAS'ILE-UPON-TYNE, ENGLAND.

LIQUID-FUEL-FIRED FURNACE.

Specification of Letters Patent Patented Mar. 16, 1915.

' Application filed March 18, 1912. Serial No. 684,479.

7 To all whom it may concern:

Be it known that '1, ANDREW LAING, a subject of the King of Great Britain," residing in Newcastle-upon-Tyne, Northumberland, England, and whose post-oflice address is 15 Osborn road, Newcastle-upon- Tyne, in the county of Northumberland, England, engineer, have invented certain new and useful Improvements in- Liquid- Fuel-Fired Furnaces, of which the following is a specification.

In liquid fuel-fired furnaces it is usual to preheat the oil or equivalent fuel to a temperature approximating to its flash point before injecting it into the furnace, so as to ob tain efficient combustion and prevent the deposit of soot. WVhen the furnace is a steam generator furnace it is usual to heat up the oil through the agency of steam derived from the boiler, but upon starting up the furnace such a heating agent is not available at any rate from the boiler fired by the furnace.

According to the present invention an auxiliary heater is provided whereby the oil may be raised to appropriate temperature before starting up the furnace. In this apparatus the oil is heated by means of a suitable burner (such as an oil flare lamp) adapted to burn, for example, naphtha or paraffin oil, and the oil is pumped from the storage tank through the heater by means of a hand pump and thence passes through thefilters to the burners.

The general arrangement of the fuel supply and preheating apparatus of oil-fired furnaces with auxiliary heater is shown in Figure 1 of the accompanying drawings, Figs. 2 and 3 being vertical sections taken in planes at right angles to each other of one construction of auxiliary heater according to this invention, the heating burners, of which there is one under each heating coil, being omitted from Fig. 2.

Referring first to Fig. l, the suction pipe 1 of a hand pump 2 is connected with the pipe 3 which leads the oil from a strainer 4 to the suction side of the regular oil pumps 5, 6 which deliver the oil to the regular steam heaters 7, 8 from whence it passes through a strainer 9 to a pipe 10 connected with the oil burners 20 of the furnace of a steam generator 21. The auxiliary hand pump 2 delivers the oil to a pipe 11 which is connected with a T-piece 12 having branches leading to two heating coils 13, 14 (Figs. 2

and 3) which are inclosed within a metal tank or casing 15 and which are preferably conical in shape with the enlarged openings directed downward so that the name and hot gases from the burner 16 placed centrally under each of these coils, such as shown in Fig. 3, will pass upward through and among the successive coils of the same; One of these burners is shown in position in Fig. n

o and although the burner fittingsfwhich are attached to the front wall of the heater are omitted from F 2, their position within the heater is obvious. The tank or casing of the auxiliary heater is preferably double walled, as shown at 17, and the space between the walls filled with asbestos or other suitable thermal insulator. The oil, after traversing the coils, passes to the branches of a second T-piece connection 12 and thence through pipe 18 to the strainer 9, pipe 10 and furnace burners. A pipe 22 (shown broken away in Fig. 1). may be arranged to be in valved connection with the steam space of the generator 21 and thus be adapted to supply steam to the pumps 5 and 6 and also to the heaters 7 and 8 through pipes 23 and 2 1 respectively. Pipes 25 and 26 serve for the exhaust from the pumps 5 and 6 and pipes 27 and 28 for draining away the water of condensation from the heaters 7 and 8. Pipes 22 to 28 may be fitted with suitable control valves where required. It will be understood that valves are interposed where necessary in the pipe connections between the supply of oil, the main pumps and fuel heaters and the auxiliary pump and heater and furnace nozzles, so as to enable either the main heating system or the auxiliary heating system to be made operative or inoperative as required. The oil fuel storage tanks are placed in such a position that the suction of the auxiliary pump 2, as well as the main pumps 5 and 6, is always drowned and the reservoir for the naphtha or parafiin or other fuel supplied to the burners 16, is placed at a height above the burners sufiicient to give the requisite pressure at the burners for efiicient atomizsaid invention and the best means I know of carrying the same lnto practlcal effect, I cla1m:

1. In a liquid fuel-fired steam generatorfurnace in which the fuel-is heated before delivery to the furnace burners, the combination of a main fuel heating system comprising a heater adapted to be heated by steam from the generator, and an auxiliary fuel heating system comprising a burnerheater heating devices, and means for rendering the two heating systems alternatively operative.

2. In liquid fuel-fired furnaces in Which the fuel is heated before delivery to the furnace burners, a main fuel heater communicating With the furnace burners, means adapted to convey a heating agent to the heater, a main feed pump adapted to supply liquid fuel to the heater, an auxiliary fuel heating device comprising in combination a heating coil communicating With the furnace burners, a burner adapted to heat the coil and an auxiliary feed pump arranged to force liquid fuel through the heating coil, and means for rendering the main heater and auxiliary heater alternatively operative.

3. In a fuel heating system for a liquid fuel fired furnace, the combination with a steam generator heated by the furnace, of a main fuel feed pump, a main fuel heater, means for supplying said main fuel heater with steam from the steam generator, an auxiliary fuel feed pump and an auxiliary fuel heater, a burner consuming naphtha or the like adapted to heat the auxiliary heater, and means for rendering the main feed pump and heater and the auxiliary feed pump and heater alternatively operative; substantially as described.

4:. A liquid fuel heating system, comprising a steam heater, a fuel supply pipe com- ANDREWV LAING.

Witnesses JAMES CRUIKSHANK HENnEnsoN, JOHN PARKIs BLENxINsoP.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.? 

